PDF outputted from excel using CutePDF Writer. 
http://www.cutepdf.com/Products/CutePDF/writer.asp 
(FREE for commercial and non-commercial use)

Excel (2007) can save PDF's too but there's a slight loss in logo quality unless PDF/A is selected
which then retains the quality but increases the filesize to 300KB.

-vari 30.10.2009